Reflector.



E. s. SLOGUM. l

REPLBGTOR. A'PPLIGATION FILED PBBTQ, 1914.

Patented Dec. .15, 1914.

EDWARD S. SLOCUM, 015' CHICAGO, ILLINOIS.

A REFLECTOR.

fracaso.

To all whom t may concern.'

Be it known that I, EDWARD S. SLooUM, a citizen olf the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and Vuseful Improvement 1n Reflectors, of which vthe vfollowing is a specification.

i My invention relates to indirect lighting fixtures, more particularly for electric lighting, and the object of the invention is to provide a reflector which will give uniform diusion over a large surface of the ceiling against which the' light is to be thrown.

I accomplish' my object by the construction illustrated in the accompanying drawing,'in which Figure l is an axial section of aaxture embodying my invention. Fig. 2 is atop planview, and Fig. 3 is an axial section of the mirror.

' Similar numerals refer to similar parts -the top of the spherical portion. In consethe different views.

The reflecting portion ofthe fixture, shown separately in Fig. 3, consists of a shallow conical portion 1 having a spherical segmental portion 2 at the center. In the present vdesign, the diameter of the segmental portion is about one-.third the total diameter of the reflector'. :f'lh-e top of the segmental portion rises to'a point slightly beneath the plane of the .upper rim of the conical portion, the center of curvature of the segmental portion being below the point where the apex of the conical portion would be located in case the side of the conical portion were produced. While the conguration may be slightly varied without exceed- "and construction.

ing the scope of the invention, the sides of the conical portion. lie preferably at an angle of approximately fifteen degrees to the lplane of the upper base of the cone, the

reflector thus being shallow but affording space for the lamps 3 in the depression 4 formed at the junction of the spherical and. conical portions.

The portions 1 and 2 are made, usually,

of glass backed by mercury or other materi al whereby the upper surface becomes reflective. rlhese portions, .which constitute a reflecting mirror, are' mounted upon and reinforced by a shell 5 of any suitable material The lamps 3, above mentioned, are carried at the inner ends of arms 6, said arms being supported at their outer ends in such manner that the lamps are verticallyr adl Specification of Letters Patent.-

' pass between lugs ratentednec. 15, 1914.

Applicationled February 9, 1314. VSerial No. 817,391.

justable. In the presenty design, the arms arranged in pairs at the rim of the device. Clevises 8 engage said lugs on 'the outside, and the parts are held together by bolts 9 provided with wing -nuts l0 whereby the parts may be tightened. By

backing off one of the nuts the parts may be loosenedv and the lamp raised or lowered as desired, whereupon, by tightening the nut, the lamp will be held fast in the posi- .tion to which it is adjusted.

' In operation, the lamps will normally be adjusted to a position similar to. that shown in the drawings, the center` of illumination beingbelow the level of the outer rim of the reflector so that all horizontal light rays will be'reflected -upward. Said center of illumination, however, will be in or near the depression formed at the junction of the conical and spherical portions of the reflector and preferably at or below the level of quence, the light rays or lumnants will all be reflected in upward direction and will be .diffused over a large area of the ceiling above.

. tion to which the lamps are adjusted.

Having thus described my invention,

what I claim as new and desire to secure by Letters Patent, is:

l. In a xturefor indirect electric-lighting,a reflector comprising a conical portion, the concave side whereof is reflective, and

a substantially spherical segmental portion concentric therewith, the segmental portion being reflective on its convex surface, the segmental portion having a diameter approximately one third of the total diameter of the reflector and the top of the segment rising to a point slightly below the plane of the top of the reflector.

2. In a fixture for indirect lighting, a reflector comprising a shallow, right truncated cone having parallel bases, a spherical segmental portion, the base whereof is coincident with the smaller base of the conical portion, the top of the spherical portion rising to a point near the larger base of the conical portion, the concave surface of the conical portion and theconvex surface of the segmental portion being reliective, and electric lamps having their illuminative cenvters located 'in the an'nular depression formedl at the juncture of the conical and segmental portions. s

3. In a fixturefor indirect lighting, the combination of a reiiector comprising'a shallow, right truncated cone having parallel bases, a spherical segmental portion the base whereof is coincident with the smaller base of the conical portion, the base of the segmentalA portion being approximately one third of thev external diameter of the conical portionQthLcenter of curvature of the segmental portion being beneath the apex 'of the conical portion if the sides ofthe latter were produced, the top of the spherical portion rising to a point near the larger base of the conical portion, the concave surface of the conical portion andthe convex surface of the segmental portion being retlective, electric lamp bulbs, and means supported atfthe periphery of therelector for holding said lamp bulbs lbeneath the larger.

base of the conical portionand withtheirV centers approximately in the depression formed at the junction ofthe conical .and segmental portions.

4. In a ixture for indirect lighting; the combination of a reiiector having a spherical portion at the center and a conical portion surrounding said spherical portion, the

top of the spherical portion being slightly scribed my name in the presence of two Witnesses. Y t

l s EDWARD S. SLOCUM.

vWitnesses: y l I Howard M. Cox, KATHRYN SREADY. 

